How to allow others to play my multiplayer game

[vague lava]

Hey, i just watched the code monkey tutorial and wanted to know if there is a guaranteed way for others to play my game in multiplayer without needing to use or spend money on unity Relay.
Is there a way to make my computer the server or something while using NGO?

[vague lava]

Oh ok relay can be used for free

cool

or... not

is the stuff on white free tiers?

So every service necessary is free to put the game running and play with like a group of friends?